Wave impedances of drill strings and other periodic media.

  title={Wave impedances of drill strings and other periodic media.},
  author={Douglas S Drumheller},
  journal={The Journal of the Acoustical Society of America},
  volume={112 6},
It is commonly known that wave reflections are caused by abrupt spatial variations in the physical parameter called wave impedance. When a material contains a spatially periodic distribution of wave impedances some very interesting and complex wave propagation phenomena will occur. Two examples of such periodic structures immediately come to mind: the first is a sandwiched structure of two types of plates, say for example, identical layers of thin steel plates interspersed with identical thick… CONTINUE READING

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